package com.iteima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.iteima.reggie.common.BaseContext;
import com.iteima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器,支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1.获取本次请求的URI
        String requestURI = request.getRequestURI();// backend/index.html

        log.info("拦截到请求:{}",request.getRequestURI());

        //定义不需要拦截的路径和静态资源
        String[] urls = new String[]{
          "/employee/login",
          "/employee/login",
          "/backend/**",
          "/front/**",
          "/common/**",
          "/user/sendMsg",//移动端发送短信验证码
           "/user/login"  //移动端登录
        };

        //2.判断本次请求是否需要处理,是不是在上面的数组里面
        boolean check = check(urls, requestURI);
        //3.如果不需要处理直接放行
        if (check){
//            log.info("本次请求不用处理:{}",requestURI);

            filterChain.doFilter(request,response);
            return;
        }
        //4.1判断登录状态,如果已经登录,则直接放行
        if(request.getSession().getAttribute("employee") != null ){
            log.info("用户已经登录,用户id为:{}",request.getSession().getAttribute("employee"));
            Long id = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(id);
            //放行
            filterChain.doFilter(request,response);
            return;
        }

        //4.2判断登录状态,如果已经登录,则直接放行
        if(request.getSession().getAttribute("user") != null ){
            log.info("移动端用户已经登录,用户id为:{}",request.getSession().getAttribute("user"));
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }

        //5.如果未登录则返回未登录结果,通过输出流方式想客户端页面返回响应数据
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;




    }

    /**
     * 路径匹配,检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
